Type cancelOrder methodName parameter to method keys of Creep/PowerCreep

[sparr]

Brief Description

Currently Creep.cancelOrder (and PowerCreep) accept any string as the methodName to cancel. This can be more tightly typed as strings at are keys of methods (not data properties) in those types.

A more accurate solution would be to enumerate all of the methods that register intents.

A few new lines in the tests file include one good and one bad call to cancelOrder.

Checklists

• Test passed
• Coding style (indentation, etc)
• Edits have been made to src/ files not index.d.ts
• Run npm run compile to update index.d.ts

[ShuP1]

creep.cancelOrder("cancelOrder"), creep.cancelOrder("getActiveBodyparts"), creep.cancelOrder("moveTo"), ... would be valid

An explicit list (string union) might be better

[sparr]

Is screeps/engine's creepActions the correct list?

var creepActions = ['drop','transfer','withdraw','pickup','heal','rangedHeal','dismantle','attack','harvest','move','repair',
    'build','rangedMassAttack','rangedAttack','say','suicide','claimController','upgradeController','reserveController',
    'attackController','generateSafeMode','signController','pull'];